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Diffstat (limited to 'drivers/dma/idxd/debugfs.c')
-rw-r--r--drivers/dma/idxd/debugfs.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/dma/idxd/debugfs.c b/drivers/dma/idxd/debugfs.c
new file mode 100644
index 0000000000..9cfbd9b14c
--- /dev/null
+++ b/drivers/dma/idxd/debugfs.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/debugfs.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <uapi/linux/idxd.h>
+#include "idxd.h"
+#include "registers.h"
+
+static struct dentry *idxd_debugfs_dir;
+
+static void dump_event_entry(struct idxd_device *idxd, struct seq_file *s,
+ u16 index, int *count, bool processed)
+{
+ struct idxd_evl *evl = idxd->evl;
+ struct dsa_evl_entry *entry;
+ struct dsa_completion_record *cr;
+ u64 *raw;
+ int i;
+ int evl_strides = evl_ent_size(idxd) / sizeof(u64);
+
+ entry = (struct dsa_evl_entry *)evl->log + index;
+
+ if (!entry->e.desc_valid)
+ return;
+
+ seq_printf(s, "Event Log entry %d (real index %u) processed: %u\n",
+ *count, index, processed);
+
+ seq_printf(s, "desc valid %u wq idx valid %u\n"
+ "batch %u fault rw %u priv %u error 0x%x\n"
+ "wq idx %u op %#x pasid %u batch idx %u\n"
+ "fault addr %#llx\n",
+ entry->e.desc_valid, entry->e.wq_idx_valid,
+ entry->e.batch, entry->e.fault_rw, entry->e.priv,
+ entry->e.error, entry->e.wq_idx, entry->e.operation,
+ entry->e.pasid, entry->e.batch_idx, entry->e.fault_addr);
+
+ cr = &entry->cr;
+ seq_printf(s, "status %#x result %#x fault_info %#x bytes_completed %u\n"
+ "fault addr %#llx inv flags %#x\n\n",
+ cr->status, cr->result, cr->fault_info, cr->bytes_completed,
+ cr->fault_addr, cr->invalid_flags);
+
+ raw = (u64 *)entry;
+
+ for (i = 0; i < evl_strides; i++)
+ seq_printf(s, "entry[%d] = %#llx\n", i, raw[i]);
+
+ seq_puts(s, "\n");
+ *count += 1;
+}
+
+static int debugfs_evl_show(struct seq_file *s, void *d)
+{
+ struct idxd_device *idxd = s->private;
+ struct idxd_evl *evl = idxd->evl;
+ union evl_status_reg evl_status;
+ u16 h, t, evl_size, i;
+ int count = 0;
+ bool processed = true;
+
+ if (!evl || !evl->log)
+ return 0;
+
+ spin_lock(&evl->lock);
+
+ h = evl->head;
+ evl_status.bits = ioread64(idxd->reg_base + IDXD_EVLSTATUS_OFFSET);
+ t = evl_status.tail;
+ evl_size = evl->size;
+
+ seq_printf(s, "Event Log head %u tail %u interrupt pending %u\n\n",
+ evl_status.head, evl_status.tail, evl_status.int_pending);
+
+ i = t;
+ while (1) {
+ i = (i + 1) % evl_size;
+ if (i == t)
+ break;
+
+ if (processed && i == h)
+ processed = false;
+ dump_event_entry(idxd, s, i, &count, processed);
+ }
+
+ spin_unlock(&evl->lock);
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(debugfs_evl);
+
+int idxd_device_init_debugfs(struct idxd_device *idxd)
+{
+ if (IS_ERR_OR_NULL(idxd_debugfs_dir))
+ return 0;
+
+ idxd->dbgfs_dir = debugfs_create_dir(dev_name(idxd_confdev(idxd)), idxd_debugfs_dir);
+ if (IS_ERR(idxd->dbgfs_dir))
+ return PTR_ERR(idxd->dbgfs_dir);
+
+ if (idxd->evl) {
+ idxd->dbgfs_evl_file = debugfs_create_file("event_log", 0400,
+ idxd->dbgfs_dir, idxd,
+ &debugfs_evl_fops);
+ if (IS_ERR(idxd->dbgfs_evl_file)) {
+ debugfs_remove_recursive(idxd->dbgfs_dir);
+ idxd->dbgfs_dir = NULL;
+ return PTR_ERR(idxd->dbgfs_evl_file);
+ }
+ }
+
+ return 0;
+}
+
+void idxd_device_remove_debugfs(struct idxd_device *idxd)
+{
+ debugfs_remove_recursive(idxd->dbgfs_dir);
+}
+
+int idxd_init_debugfs(void)
+{
+ if (!debugfs_initialized())
+ return 0;
+
+ idxd_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+ if (IS_ERR(idxd_debugfs_dir))
+ return PTR_ERR(idxd_debugfs_dir);
+ return 0;
+}
+
+void idxd_remove_debugfs(void)
+{
+ debugfs_remove_recursive(idxd_debugfs_dir);
+}